Cover the floor of the van with a tarpaulin, plastic sheeting or other water resistant
material to minimize clean up after removing the filter media. Use disposable con-
tainers such as plastic garbage bags to remove spent media.
a. Refer to Figure 4-62 and remove media from tank (36) as follows:
Valves are open when handles are parallel to lines.
(1) Open vent valve (1).
(2) Open drain valve (2) and drain filter.
N O T E
Refer to the media level diagram at the right side of Figure 4-62. Levels 1 and 2 are
support gravels for the finer filter materials above. These gravels are not normally
replaced. If the gravel levels 1 and 2 become plugged, notify direct support
(3) Remove clamp (3), cap (4) and gasket (5) and scoop out the level 3, 4 and 5 media through the lower port.
(4) Remove media down to level 2.
b. Replace the media in the filter as described below and shown in Table 4-7, Filter Loading Requirements.
Table 4-7. Filter Loading Requirements
Media, Fine Filter
Media, Coarse Filter
(1) Remove clamp (7), cap (8) and gasket (9).
(2) Load level 3 through the top port and level it with the chemical mixing paddle or other suitable stick. Note in
Figure 4-62 that the level goes about 1/2 way across the lower port. The level 3 media should be banked lower at the
port to keep from running out of the port.
Install beaded side of gaskets toward the media filter,
(3) Clean the gasket sealing surfaces carefully at the lower port and cap (4) and install gasket (5), cap (4) and clamp
(4) Load level 4 through the top port and level it with the chemical mixing paddle or other suitable stick.
It is important that level 4 does not cover the air manifold in the filter. Load this level
carefully and level it frequently (between installing bags of media). The top of level 4
will be just below or at the air manifold rings if level 3 was carefully removed during
the media removal procedure.
Change 2 4-219